Descriptions for H04R and notes/indexes are displayed on this screen.
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LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS (producing sounds with frequency not determined by supply frequency G10K)[6]
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Note(s)
This subclass covers:[7]loudspeakers, microphones, gramophone pick-ups or like transducers producing acoustic waves or variations of electric current or voltage;arrangements actuated by variations of electric current or voltage for cutting grooves in records;circuits for the above-mentioned arrangements;monitoring or testing the above-mentioned equipment. Attention is drawn to the Notes following the titles of class B81 and subclass B81B relating to "microstructural devices" and "microstructural systems".
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Subclass indexes
TYPES OF TRANSDUCER | With magnetic circuit: | moving coil; moving armature; magnetisable diaphragm; magnetostriction | 9/00; 11/00; 13/00; 15/00 | Without magnetic circuit: | piezoelectric; electrostatic; with variable resistance | 17/00; 19/00; 21/00 | Other types | 23/00 | Details | general; circuits; diaphragms and cones | 1/00; 3/00; 7/00 | APPLICATIONS | Stereophonic arrangements; deaf-aid; public address systems | 5/00; 25/00; 27/00 | MONITORING, TESTING; MANUFACTURE | 29/00; 31/00 |
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